Otto w



UNITED STATES PATENT OFFICE.

OTTO W. LOEFFILER, OF NEW YORK, N. Y-

FILE.

SPECIFICATION forming part of Letters Patent No. 368,097, dated August 9, 1887.

Application filed lilarch 30, 1887. Serial No. 232,947. (No model.)

To all whom. it may concern.-

Be it known that I, OTTO W. LOEFFLER, of

' of the city, county, and State of New York,

haveinvented certain new and useful Improvements in Files, of which the following is a specification.

This invention relates to an improved construction of files of that class composed of a number of steel .plates or teeth which can be conveniently sharpened onthe surface of a grindstone without tempering the same; and the invention consists of a file the body of which is formed of a series of steel plates or teeth having opposite beveled and serrated edges and recesses in their sides. The steel plates or teeth are retained by a closed frame composed of parallel bars that are fitted into the side recesses of steel plates, the frame being provided with afixedinclined check at one end and vwith an inclined adjustable check at the other end. The adjustable check is tightly applied to the inclined body of the steel plates by an intermediate slide-piece and a clamp ing-screw of the supportingframe, the inner end of which is fitted into a socket of said intermediate piece, as will appear more fully hereinafter, and finally pointed out in the claims. y

In the accompanying drawings, Figure 1 represents a top view of my improved file. Fig. 2 is a side elevation; Fig. 3, a top view, partly in section, of the frame of the file, with the steel plates or teeth removed therefrom. Fig. 4 is a side view of said frame, and Fig. 5 a detail side view of one of the steel plates.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, a a reprcsenta se ries of steel plates or teeth,which form together the body of my improved file. Each steel plate or tobth a is beveled at two opposite ends, and provided with longitudinal ribs at one side, so as to form beveled and serrated edges atopposite ends of each tooth. Each steel plate or tooth a is provided in its sides, intermediately between the serrated'edgeswith recesses a, by which the steel plates or teeth a are seen red to a closed supporting-frame, B, which is formed of two parallel side bars that are connected rigidly at the ends, as shown in Fig. 2. The frame B is provided at one end with a shank, b, to which a handle, 0, is applied. The

steel plates or teeth a are supported at an angle of inclination to the axis of the frame 13, between a fixed check, (I, near the handle 'end of the frame, and an adjustable check, (1, at the opposite end of the frame B, the faces of the fixed and movable cheeks d d being parallel to each other and arranged at an angle of inclination to the axis of the frame. \Vhen the body of steel plates or teeth is inserted between the fixed and adjustable checks (1 d, the adjustable cheek d is tightly clamped against said teeth by means of a set-screw, e, in the outer end of the frame B. The set-screw cengages by its inner smaller end a socket, e, of an intermediate slide-piece, 6 which is fitted by a pin, 6 at the opposite end into asockethole of the adjustable cheek d,as shown clearly in Figs. land 3. The checks (1 dare of smaller height than the steel plates or teeth a, as shown in Figs. 2 and 4, the movable check cl being,

however, equal in width with the frame and steel plates and recessed at the sides, so as to be guided on the side bars of the supportingframe, as shown in Fig. 1. When the clamping-screw e is loosened, the intermediate slidepiece, 6 and the adjustable cheek d may be moved away from the body of steel plates or teeth in the frame, so that by turning the steel plates in the direction of the axis of. the supporting-frame B they may be removed without difficulty from the same for being placed in a suitable clamping-frame, by which they are supported, and sharpened on a grindstone without requiring tempering.

The clamping-frame forms the subject-matter of a separate concurrent application filed at the same time herewith.

Having thus described my inventioml claim as new and desire to secure by Letters Patent 1. The combination of a closed supportingframe composed of two parallel side bars, a fixed cheek at one end of the same, amovable cheek having side recesses at opposite end of said frame, a series of steel plates or teeth provided with side recesses and being interposed between said cheeks, a clamping-screw at the outer end of the frame, and an intermediate slide-piece interposed between the movable cheek and the clamping-screw, and provided with a pin for engaging a socket of the movable cheek, substantially as set forth.

2. The combination of a closed supporting- Too frame composed of two parallel side bars, a engaging a socket of the movable cheek, subfixed cheek at one end of the same, a movstantially as set forth.

able cheek having side recesses at opposite In testimony that I claim the foregoing as end of said frame, a series of steel plates or my invention I have signed my name in the 5 teeth provided with side recesses and being presence of two subscribing witnesses.

interposed between said cheeks a clamping- 1 4 screw at the outer end of the franle, said elu/lnp- OTTO LOPJFFLLR' iug-screw being provided with a pin, and an 'Witnesses: intermediate slidepieee having a socket for CARL KARI, IO the pin of the clamping-screw, and a pin for SIDNEY MANN. 

